Insulator and support therefor



H. O. ROCKWELL INSULATOR AND SUPPORT THEREFOR Filed April 3, 1922 i IINVENTOR. fqrfierlafiaafwell A TTORNEY Patented Aug. 19, 1924.

UNITED STATES PATENT OFFICE.

HERBERT O. ROCKWELL, OF NEW BRITAIN, CONNECTICUT, ASSKGNOR 'IO BRADYELECTRIC 8: MANUFACTURING COMPANY, OF NE'W BRITAIN, CONNECTICUT, A.

CORIORAIION OF CONNECTICUT.

INSULATOR SUPPORT THEREFOR.

Application filed April 3,

T all whom 1' 2 may concern Be it known that I, HERBERT O. RoonwnnL, acitizen of the United States, and a resident of New Britain, county ofHartford 5 and State of Connecticut, have invented certain new anduseful Improvements in Insulators and Supports Therefor, of which thefollowing is a specification.

This invention relates to combination insulators and supports and moreparticularly to an improved form of split insulator and support forholding an insulated wire or cable at a distance from pole, wall orother surface.

One object of the invention is to provide a split insulator comprising apair of interlocking sections which may be readily as sembled and takenapart.

A further object is to provide an insulator of the above nature whichwill be automatically drained and ventilated under all weatherconditions.

A further object is to provide a tubular insulator of the above nature,having a series of longitudinal ribs which will exert a firm grip uponthe conductor carried therein.

A further object is to provide a tubular insulator of the above naturehaving a series of relatively wide ribs on its inner surface wherebythere will be little tendency for weakening the glass or porcelain ofthe insulator as is the case with the narrow ribs which have been usedon such insulators in the past.

A further'obj ect is to provide an improved form of clamp for asplit-insulator provided with a pair of detachable hinged aws.

A further object is to provide a split in sulator and clamp thereforwhich will be composed of relatively few parts and which will be simple,cheap to manufacture, and highly efficient and durable in use.

With these and other objects in view, there has been illustrated in theaccompanying drawing one form in which the invention may be convenientlyembodied in practice.

Fig. 1 represents a perspective view of the split insulator clampshowing a duplex insulated wire in position therein.

Fig. 2 is an elevational view of one section of the split insulator.

1922. Serial No. 549,347.

Fig. 3 is a similar view of the other section of the split insulator.

Fig. 4 is a. sectional view of the section of the split insulator shownin Fig. 3, taken along the line 4l, looking in the direction of thearrows.

Fig. 5 is a perspective view, partly broken away. of the screw-bolt, asit appears in one stao e of its manufacture.

d 6 is a perspective view of the stationary jaw of the insulator clamp,as it appears in one stage of its manufacture before the screw-bolt hasbeen secured in position.

'Fig. 7 is a perspective view of the movable jaw of the insulator clampshown in detaehed position.

Fig. 8 is perspective view of the machine bolt and nut employed toadjustablv hold together the hinged jaws of the in sulator clamp.

Referring now to the drawings in which like reference numerals denotecorresponding parts throughout the SBVBZll views, the numerals 10 and 11denote the two complementary split sections of a tubular insulatorcomposed of any suitable insulating mall rial, but preferably ofporcelain. Each of the split sections 10 and 11 is provided on its innersurface with three longitudinal relatively wide ribs 12 and 13,respectively These ribs 12 and 13 are adapted to firmly grip the surfaceof an insulated wirc 14 which may be carried therein, and by rea son ofthe grooves between said ribs. the surface of the insulation will at alltimes be exposed to the atmosphere, thereby pen mitting automaticdrainage and ventilation to take place.

The insulator sections 10 and 11 are provided with intermediatecylindrical neck portions 15 and 16, and end flanges 1'2" and.

18 respectively. Moreover, on the flat inner.

faces of the insulator sections, interlocking?- ribs and grooves 19, 20,21, and 22 are provided so that the parts will be accurately held inalinement when assembled.

In order to hold the split insulators and the wire carried therein inposition spaced from a pole, wall or other surface, a pair of clampingjaws 23 and 24 are provided.

These clamping jaws are provided with semicylindrical central sectionsand 26 respectively. They are also provided with flat free end sections27 and 28 having bolt holes 29 and 30 to receive an adjusting bolt 30.As clearly shown in Fig. 8, the adjusting bolt 30 is threaded throughoutits length and is provided with a head 30 and nut 30 The stationary jaw23 has a slightly curved end section 31, which is provided with alongitudinal hinge-slot 32, as clearly shown in Fig. 6. This hinge-slot32 is adapted to detachably receive the tip 33 of the tongue 34. formedon the movable clamping jaw 24., so as to permit said jaws 23 and 24 tobe readily opened and closed as desired.

As clearly shown in Fig. 6, the central portion 26 of the stationaryclamping jaw is provided with a rectangular aperture 35 whose sides makeangles of forty-five degrees with the sides of the aw 23. In order tosecure the insulator and wire to a pole, wall or other surface, a screwbolt 36 is provided. This screw bolt 36 has a squared inner end 37adapted to be inserted into the aperture 35 of the jaw 23, where.it isthen upset to form an enlarged head, the outline of which is indicatedby the dotted circle in Fig. 6. The stationary jaw 23 will thereby bepermanently locked to said bolt 36. The opposite end of the bolt 36 isprovided with screw threads 38 adapted to be screwed into the pole. Thebolt is also provided with a flanged shoulder member 39 held againstrotation by a pair of diametrically opposed ribs 40, and held againsttranslation by said ribs 40 and an upset portionnot shown of the rodbehind the shoulder. The clamping member and screw bolt are preferablyconstructed from iron or steel which may be later galvanized, but itwill be understood that other suitable metals may be employed ifdesired.

WVhile there has been disclosed in this specification one form in whichthe invention may be embodied, it is to be understood that this form isshown for the purpose of illustration only and that the invention is notto be limited to the specific disclosure but: may be modified andembodied in vari ous other forms without departing from its spirit. Inshort, the invention includes all the modifications and embodimentscoming within the scope of the following claims.

Having thus fully described the invention, what is claimed as new andfor which it is desired to secure Letters Patent, is:

1. A self-draining and ventilating insulator for holding an insulatedwire or cable, comprising in combination, a pair of interfittingcomplementary sections adapted to enclose said wire or cable, each ofsaid sec tions being provided with a plurality of wire engaginglongitudinal ribs on its inner surface to grip the insulated wire orcable and adapted to permit drainage and ventilation thereof, saidsections being adapted to be held together by a clamp.

2. In a self-draining insulator for holding an insulated wire or cable,a pair of semi tubular complementary sections, each of said sectionsbeing provided with a plurality of longitudinal ribs for gripping saidinsulated wire or cable and permitting drainage and ventilation thereof,said sections being adapted to be held together by a clamp.

In a self-draining and ventilating insulator for electrical conductors,a plurality of inter-fitting sections adapted to be clamped together toform a tubular body, each of said sections having a rib on its innersurface for gripping the outer surface of a conductor, the spacesbetween said ribs serving as channels to permit drainage and ventilation.

4. In a self-draining and ventilating insulator for an electricalconductor, a tubular insulating member composed of a plurality ofintertitting sections adapted to be clamped together, said member havinga plurality of longitudinal ribs on its inner surface, said ribs servingthe double purpose of gripping the conductor and permitting drainage andventilation thereof.

In a self-draining and ventilating insulator for electrical conductingwires, a pair of identical interfitting insulator sections adapted to beclamped together into the form of a tube, each of said sections having aplurality of longitudinal ribs on its inner surface, said ribs beingadapted to grip the outer surface of said conductor, and the channelsbetween said rigs permitting drainage and ventilation thereof.

6. In a self-draining and ventilating insulator for an insulatedconducting wire, a pair of complementary semi-tubular wire engagingsections adapted to be clamped into tubular form for enclosing saidcon-- ducting wire, each of said sections having longitudinal ribs togrip said conductor and also having a rib and groove adapted to interfitwith a similar groove and rib on the opposite section.

In testimony whereof, I have affixed my signature to this specification.

HERBERT O. ROCKWELL.

